0001001 - Document - Cover Page
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1001002 - Statement - Consolidated Statements of Income
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1002003 - Statement - Consolidated Statements of Income (Parenthetical)
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1003004 - Statement - Consolidated Statements of Comprehensive Income
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1004005 - Statement - Consolidated Balance Sheets
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1005006 - Statement - Consolidated Balance Sheets (Parenthetical)
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1006007 - Statement - Consolidated Statements of Stockholders' Equity
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1007008 - Statement - Consolidated Statements of Stockholders' Equity (Parenthetical)
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1008009 - Statement - Consolidated Statements of Cash Flows
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2101101 - Disclosure - Organization and Basis of Presentation
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2202201 - Disclosure - Organization and Basis of Presentation (Policies)
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2303301 - Disclosure - Organization and Basis of Presentation (Tables)
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2404401 - Disclosure - Organization and Basis of Presentation (Details)
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2405402 - Disclosure - Organization and Basis of Presentation - Activity in Uncollectable Accounts (Details)
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2106102 - Disclosure - Revenue
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2307302 - Disclosure - Revenue (Tables)
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2408403 - Disclosure - Revenue (Details)
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2109103 - Disclosure - Discontinued Operations
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2310303 - Disclosure - Discontinued Operations (Tables)
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2411404 - Disclosure - Discontinued Operations - Narrative (Details)
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2412405 - Disclosure - Discontinued Operations - Summarized Results (Details)
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2113104 - Disclosure - Earnings Per Share Of Common Stock
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2314304 - Disclosure - Earnings Per Share Of Common Stock (Tables)
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2415406 - Disclosure - Earnings Per Share Of Common Stock (Details)
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2116105 - Disclosure - Pension and Other Post-Employment Benefits
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2317305 - Disclosure - Pension and Other Post-Employment Benefits (Tables)
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2418407 - Disclosure - Pension and Other Post-Employment Benefits (Details)
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1109106 - Statement - Accumulated Other Comprehensive Income
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2319306 - Disclosure - Accumulated Other Comprehensive Income (Tables)
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2420408 - Disclosure - Accumulated Other Comprehensive Income - Changes in AOCI (Details)
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2421409 - Disclosure - Accumulated Other Comprehensive Income - Amounts Reclassified (Details)
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2122107 - Disclosure - Income Taxes
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2423410 - Disclosure - Income Taxes (Details)
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2124108 - Disclosure - Fair Value Measurements
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2325307 - Disclosure - Fair Value Measurements (Tables)
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2426411 - Disclosure - Fair Value Measurements - Recurring Assets and Liabilities (Details)
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2427412 - Disclosure - Fair Value Measurements - Level 3 Rollforward (Details)
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2428413 - Disclosure - Fair Value Measurements - Level 3 Quantitative Information (Details)
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2429414 - Disclosure - Fair Value Measurements - Investments Held in Trusts (Details)
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2430415 - Disclosure - Fair Value Measurements - Proceeds from the Sale of Investments (Details)
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2431416 - Disclosure - Fair Value Measurements - Carrying Amounts of Long-term Debt (Details)
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2432417 - Disclosure - Fair Value Measurements - Narrative (Details)
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2133109 - Disclosure - Regulatory Matters
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2434418 - Disclosure - Regulatory Matters - Maryland and New Jersey (Details)
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2435419 - Disclosure - Regulatory Matters - Ohio (Details)
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2436420 - Disclosure - Regulatory Matters - Pennsylvania and West Virginia (Details)
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2137110 - Disclosure - Commitments, Guarantees and Contingencies
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2338308 - Disclosure - Commitments, Guarantees and Contingencies (Tables)
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2439421 - Disclosure - Commitments, Guarantees and Contingencies - Potential Collateral Obligations (Details)
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2440422 - Disclosure - Commitments, Guarantees and Contingencies - Narrative (Details)
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2141111 - Disclosure - Segment Information
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2342309 - Disclosure - Segment Information (Tables)
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2443423 - Disclosure - Segment Information - Narrative (Details)
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2444424 - Disclosure - Segment Information - Financial Data (Details)
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